4.5 Operating at Reduced Capacity
WARNUNG:
DO NOT operate pump below minimum rated flows or with suction and/or discharge valve
closed. These conditions may create an explosive hazard due to vaporization of pumpage
and can quickly lead to pump failure and physical injury.
HINWEIS:
Damage occurs from:
1.
Increased vibration levels - Affects bearings, stuffing box or seal chamber, and mechanical
seal.
2.
Increased radial loads - Stresses on shaft and bearings.
3.
Heat build up - Vaporization causing rotating parts to score or seize.
4.
Cavitation - Damage to internal surfaces of pump.
4.6 Operating Under Freezing Conditions
Exposure to freezing conditions, while pump is idle, could cause liquid to freeze and damage the
pump. Liquid inside pump should be drained. Liquid inside cooling coils, if supplied, should also be
drained.
4.7 Shutdown
1.
Slowly close discharge valve.
2.
Shut down and lock driver to prevent accidental rotation.
WARNUNG:
When handling hazardous and/or toxic fluids, proper personal protective equipment should
be worn. If pump is being drained, precautions must be taken to prevent physical injury.
Pumpage must be handled and disposed of in conformance with applicable environmental
regulations.
4.8 Final Alignment
WARNUNG:
Alignment procedures must be followed to prevent unintended contact of rotating parts.
Follow coupling manufacturer's coupling installation and operation procedures.
1.
Run the unit under actual operating conditions for a sufficient length of time to bring the pump
and driver and associated system up to operating temperature.
2.
Remove coupling guard. Refer to coupling guard installation and disassembly instructions in Ap-
pendix II.
3.
Check alignment while unit is still hot per alignment procedure in the Installation Section.
4.
Reinstall coupling guard.
4.5 Operating at Reduced Capacity
30
3996 Installation, Operation and Maintenance Instructions
